It could be what's called "air hunger". I hope you don't mind, but I looked at some of your other posts to try to get some background. Have you gotten your thyroid tested yet? If not, then please do. Your fatigue, sinus congestion, stomach problems, air hunger, etc, could all be stemming from one cause. Ask your dr to run TSH, FT3, FT4, and thyroid antibodies tests. Don't let them just run or look at TSH. You need all these tests to give a full view of what your thyroid's doing.
Please keep us posted.